How do I approach Product / Decision Making interview questions?

Product / Decision Making questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master product / decision making interviews.

What difficulty level is this interview question?

This is a medium difficulty Product / Decision Making question, commonly asked during Take-home Project rounds at TikTok.

What role is this question designed for?

This question is commonly asked for Product Manager candidates at TikTok during technical interviews.

Break a Palindrome Algorithm

Last updated: Mar 29, 2026

Quick Overview

This question evaluates algorithmic reasoning and product decision-making by testing string-manipulation skills, constraint handling, and concise edge-case analysis within the domain of product/decision-making and algorithm design.

TikTok

Jul 4, 2025, 8:28 PM

Product Manager

Take-home Project

Product / Decision Making

Break a Palindrome to the Lexicographically Smallest Non-Palindrome

Task

Given a palindromic string of lowercase English letters (length 1 to 1,000), replace exactly one character so that:

The result is no longer a palindrome, and
It is the lexicographically smallest possible string among all valid one-character replacements.

Return the resulting string, or an empty string if it cannot be done.

What to Provide

Describe your algorithm.
Call out key edge cases (e.g., single-character input).
Analyze time and space complexity.

Solution

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